简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4
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简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4
简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4
简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4
简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4
1/7+3/5+2/5+5/7
=1/7+5/7+3/5+2/5
=6/7+1
=1又6/7
3/4+6/13+7/13-1/4
=3/4-1/4+6/13+7/13
=1/2+1
=1又1/2
1/7+3/5+2/5+5/7
=(1/7+5/7)+(3/5+2/5)
=6/7+1
=1又6/7
3/4+6/13+7/13-1/4
=(3/4-1/4)+(6/13+7/13)
=2/4+1
=1又1/2
1/7+3/5+2/5+5/7
=(1/7+5/7)+(3/5+2/5)
=6/7+1
=13/7
3/4+6/13+7/13-1/4
=(6/13+7/13)+3/4-1/4
=1+1/2
=3/2
1/7+3/5+2/5+5/7=(1/7+5/7)+(3/5+2/5)=6/7+1=1又6/7
3/4+6/13+7/13-1/4=(3/4-1/4)+(6/13+7/13)=2/4+1=1又1/2.
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